(Windows only) This option forces A-Shell to identify instances in the same way that it does if it detects the presence of NT Terminal Server (or the subsequently renamed Windows Terminal Server). This is useful both for testing and possibly for variations of NT Terminal Server, such as Citrix, which may not be automatically detected properly. A-Shell needs to use a different window numbering scheme when running under Terminal Server , since with the normal scheme, it would end up generating duplicate IDs.